Form or mold for concrete



March 3, 1931. J. K. G01N I FQRM OR MOLD FOR CONCRETE Filed Jan. 16, 1929 4 Sheets--Sheecl l llhllllllhhnvdhmhhu I m marmi March 3, `19314. i

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4 uNlTED [STATES Patented VMar.Y 3, 1931 PATENT OFFICE 'JOHN K. GOIN, OF UNIVERSITY CITY, MISSOURI FORM OR MOLD FOB- CONCRETE I Y Appiicaeipn ined January 1e, 1929. Serin No. 332,817.

rlhis invention relates'to ormsor molds for the formation of concrete structures such as conduits, bridges and other hollow devices. An object of the invention is to provide a form or mold comprising a series of angular mold sections assembled to provide a form or mold that is pclygonal'in end elevation or cross section, in combination Vwith mechanism for moving said sections radially from a l common axis and at the same time bracing Vand strengthening the overlapping portions of said sections.

Another object of the invention is to provide a form or mold'of the type and characl5 ter mentioned including mea-ns 'for forming and shaping the exterior surfaces or" the polygonal conduits, bridges and hollow structures. f

Otherobjects will appear from the follow A ing description, reference' being made to the drawings in which I' have shown dillerent embodiments of the invention and in which,

F ign-1 is an end elevation of a preferred embodiment.

Fig. 2 is a cross sectional view approximately on 'the line 2 2 of Fig. 1;

Fig. 3 is a cross sectional view on the line 3-4 of Fig. 2 showing the form or mold extended to its capacity.

Fig. l isa cross sectional view on the same line showing the form of mold reduced to smaller dimensions.

Figs. 5 and 6 are cross sectional views taken on the line 5-5 ot F ig; 2, Fig. 5 showing the vform or mold of reduced size, and Fig. 6 showing the said form or mold extended.

Figs. 7 and 8 are sectional views showing a modified type ot expanders for the mold sections. y

The wall of the form or mold comprises a series of angular metallic sections oit' a llength sufficient to ormfand complete the conduit, bridge or other hollow device. Each angular metallic section comprises a part 1 and a part 2integrally connected and extending at righ't angles to each other. These wall members are assembled and maintained in a relationship in which a Jform or mold approximately square in cross section is provided, although it is obvious that the device may be varied in this regard, if desired. The

parts 1 and 2 of each wall member lap the adjacentlparts o1 the corresponding wall mein-ber in sliding relationship.

Longitudinally in the corner of each wall member angular bar 3 is secured. These bars 3 are of suflicient strength and rigidity to prevent damage to the wall members which may be, and preferably are, composed of sheet metal shaped in the form shown and described. rin angle bar 4 is attached to the inner side of each wall member that is lapped on its outer side by an adjacent wall member. The bars 3 and 4 preferably extend the full length of the device so as to obtain the necessarystrength and resistance to the weight ot the concrete. A shaft 5 extends longitudinally and axially through the device and has iixed thereon at spaced intervals gears 6 and 7. Expander racks 8 have their outer ends pivoted to the bars 3 and their inner portions meshing with the gears 6. Brace racks 9 have their outer ends pivoted to the bars a and their inner portions meshing with the gears 7. The gears 6 and 7 are between spaced plates 10 which function to `guidc-i and prevent the racks from becoming laterally disengaged from the gears. The plates 10 do notl rotate with the shaft 5. Said plates support between them guides 11 which -hold the respective racks in mesh with the respective gears 6 and 7 These plates are all rigidly connected by tie rods 10 extending longitudinally from end to end of the device.

There is one set of these expanders 8 and* these braces 9 near each end of the device and there may be others at intervals along the length of the form or mold.

The disc l() at one end of the mold supports a bracket 12 in which a worm 13 is journaled for rotation, being provided with a polygonal axial extension 14 for engagement with a crank or similar operating device. The worm 13 meshes with a gear'- 15 on the shaft 5. Obviously, rotation of the worm will rotate the shaft 5 and thereby the gears 6 and 7 to operate the expanders 8 and the braces 9 to expand and to contract the form or mold. The difference in extent of radial movement of the portions of the'niold sections collars 19 are adjustable to hold thegrods` V18j in Ltheir different adjustments so as to perand the overlapping portions yof said Ysectionsis taken care of by looseness of the mesh of the `gears with the raclrs. This is made possible because the extent of expansion and contraction is` about four to six inches, Vmore orless.v r

In order to assist in determining the proper thickness of the Walls l provide auxiliary sections16'adapted to seat against abutments 17 on the ends of rods' 13. rllhes'erods l13 operate through collars 19 on arms 2O which swing from the shaft 5. Setscrevvs 21 in the mit positioning of the sections 16 at any de.-

fsi're'd distance'avvay from the Wall of the form or kino-ld. rlhe Walls 1G may be of sheet metal, as indicated by dotted lines in nig. 2, or of ""f Wood, as shown in Figs. 3 and 4.

ln thevariation of the'ii'ivention shown lin jfEigs 7 and 8 racks 22 have their louter ends {pivotally connected With-angle bars 23 in the corners of thermoldivall sections 2d by links 25, .These racks 22 mesh With-gears x26 on the shaft 27v and are guided by fixed Y guides 28 supported by the discs 29 between Y Which the gears 26a-re located. n this form f of the invention the bracing racks 30 have theirfouter ends pivoted to bars 31 attached to the overlapping portions of the Wall secj'tions24i and mesh vvith gears 32 on the shaft 27 andare guided by guides 33 attached to the discsQQ'betv/'een which the gears 32 are located. rllhis form of the invention is operated inthe same vvay to expand and contract the l form or mold as previously described.

In using the device to form conduits, bridges, etc., a bottom layer of concrete is first deposited and the form or mold placed thereon in proper adjustment. rlhe auxiliary sections 16are properly adjusted beyond the vsides of the form or mold' and the space bey"tween saidauxiliary sectionsa'nd the sides of the form or vmold are filled With concrete.

- ylhe upper edges of the auxiliary'walls 16 extend to the height to which it is desired to i build the conduit or bridge sothat the conf'ficretemay bepoured also upon the' top of the former mold, as will be understood by ref- 'lere'nce to fF ig. 41.' i The upper edges'of the auxiliary Walls 16, therefore, constitute guides for gages to indicates to the Workmen the height to which the concrete lshould be poured.

f A-fterthe concrete has hardened and solidified sufhciently, the forin or mold is contract-ed and Withdrawn from the Work.,` Also,

the auxiliary Walls 16 may beloosened and removed..y ,-f

I ainfaware that there may be other changesV `and 'modifications Within 'equivalent limits Without departure from the nature and prin- Vciple of the invention.

" Whatll'claim and desire to secure by Let 1. A forin'comprising a series of angular Wall sections assembled in approximately rectangular form and each having one edge lapping the edge of anv adjacent section, a rotary shaft, series Vof gears'attached to said shaft, series of racks having their outer ends pivotally connected With the corners of said Wall sect-ionsrespectively and having their .inner portions meshing with corresponding ones of said gears, another series 'ofracks having their outer ends pivota'lly connected With the lapped portions of said Wall sec-- tions respectively and having their inner portionsmeshing with corresponding ones of said gears, guides for all of said racks, and

mechanism for rotating'said shaft and tnereby said gearsV to move said racks longitudiynally and thereby move said vWall sections outwardly and Yinvvardly and support said V.Wall sections from distortion in all positions there of.

2. A form comprising a seriesV of angular Wall sectionsassembled in approximately-` rectangular form and eachhaving one kedge lapping the edge of an adjacent section, a rotary shaft, seriesof gears attached to said shaft, series of racks having their outer ends pivotally Vconnected With the corners of said Wall sections respectively and having their inner portions nieshingwith corresponding ones of'said gears, anotherseries of racks having their outer ends pivotally connected With the lapped portions of said Wall sec'- tions respectively and having their inner por-y tions meshing With corresponding ones of v*form provided by said sections as aforesaid,v series of gearsV onsaid shaft, racks having `their inner ends meshing With said gears and their outer ends connected with the corners of said sections respectively, other racks'having their inner ends'meshing With certain of said gears and their outer ends pivotally connected with lapping `portions of said Wall sections respectively, andV mechanism for rotating said shaft "tomove' said racks and thereby move said Wall sections to` different adjustments to provide .foims of different sizes and to support said Wall sections undistorted in all lof said positions;

` ,Y Y JOHN K. GOIN. 

